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    <title>Document</title>
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    <h2>1.强制缓存</h2>
    <img src="./defaultUser.png" width="100" alt="" />
    <h2>2.max-age协商缓存</h2>
    <img src="./img-share-bg.png" width="100" alt="" />
    <h2>3.last-modified协商缓存</h2>
    <img src="./b_header.jpg" width="100" alt="" />
    <h2>4.eTag协商缓存</h2>
    <img src="./img4.png" width="100" alt="" />
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